Keep in mind that some vendors may actually include gratuity in their overall cost, so don't forget to check your contracts to make sure the tip, a.k.a. "service charge," is not included in your bill. But for those who do get a gratuity, give them cash in sealed, labeled envelopes, and including a handwritten thank-you note is a nice touch. Here's what's customary for each of your vendors:

Officiant: $50 for a judge or clerk; a $100 donation to a clergy member's house of worship, as they generally don't accept tips

Band or DJ: $25 to $50 per person

Photographer or Videographer: $100 to $200 for the main shooter, unless he or she owns the business (then no tip is needed); $50 to $75 for second shooters

Catering manager: $250 to $500

Wait staff: 15 percent of the total pretax food bill

Bartenders: 10 to 15 percent of the total pretax bar bill

Drivers: 15 to 20 percent of the total transportation bill

Valets: $1 to $2 per car

Restroom and coat-check attendants: $.50 to $2 per guest

Makeup and hair professionals: 15 to 20 percent of the total bill for each

Deliverymen: $5 to $20 each

List look a little shorter than expected? Remember that your cake baker, stationer, and florist — basically, any wedding vendor who's self-employed or is the owner of a business — will not be expecting tips. So you can take that out of your wedding budget!